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The Raspberry Pi, when isn't connected to the Internet can not synchronize its clock (date and time). So for a Raspberry Pi isolated synchronize the date and time can be achieved by GPS satellite synchronization. In this example we use a GPS receiver with a USB connection.

GPS receiver

Any GPS should head, insofar as it sending data to the NMEA standard. The time and date are provided in the frame GPRMC, we use a model VK-162, available from Banggood

Receive GPS data

Then check if it sends back NMEA sentences, i.e. using cat: (CTRL-C to quit)